CN212148520U - Active equalization control system of power battery pack - Google Patents
Active equalization control system of power battery pack Download PDFInfo
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- CN212148520U CN212148520U CN202020551424.8U CN202020551424U CN212148520U CN 212148520 U CN212148520 U CN 212148520U CN 202020551424 U CN202020551424 U CN 202020551424U CN 212148520 U CN212148520 U CN 212148520U
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- battery pack
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- power battery
- control module
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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Abstract
The utility model discloses an active equalization control system of a power battery pack, which comprises a power battery pack, an information acquisition module, a main control module, a DC/DC module, an overcurrent protection module, an equalization control module and an equalization circuit module; one end of the information acquisition module is connected with each single battery in the power battery pack, and the other end of the information acquisition module is connected with the main control module; the input end of the balance control module is connected with the main control module, and the drive end of the balance control module is connected with the power battery pack through the balance circuit module; the equalization circuit module comprises a switch network formed by connecting a plurality of groups of analog electronic switches and rectifier diodes in series, and the switch tube is connected to each node of the series battery pack through the rectifier diodes. The utility model discloses use the inductance as energy storage component, by MOS switch tube decision energy transfer direction, can realize the transmission of energy between two arbitrary batteries in the group battery, avoid the energy loss that unnecessary charge-discharge caused, can reach the purpose quick, the balanced power battery group of high efficiency.
Description
Technical Field
The utility model relates to a power battery group initiative equalizing control system belongs to battery management technical field.
Background
The power battery technology becomes a hot spot of domestic and foreign research as a key technology for the development of the electric automobile industry. As a core component of an electric vehicle, a power battery is acknowledged as the biggest bottleneck restricting the industrialization of new energy vehicles at present, and one of the main reasons is the inconsistency of single batteries when the batteries are used in a group, so that the comprehensive performance of a battery pack is reduced, the battery pack is used in an overrun way, and the safety and the service life of the battery pack are seriously influenced. Therefore, the problem of inconsistency of the battery pack in use is solved, and the battery pack is subjected to balanced management and control, which is very important.
The battery equalization management technology is used as a key technology of the battery management technology, and the battery characteristics of the battery pack can finally reach a consistency state by effectively performing equalization management on the battery pack. At present, battery equalization management schemes are mainly divided into two categories, namely energy dissipation type equalization and energy non-dissipation type equalization. The energy dissipation type balance is represented by a resistance balance method, and has the advantages of simple structure, high circuit reliability and the disadvantages of large energy loss, low efficiency and large temperature rise, and does not accord with the energy-saving and environment-friendly concept of new energy automobiles. The non-energy dissipation type equalization transfers energy from a high-energy cell in the battery pack to a low-energy cell or battery pack through the energy transfer function, realizes the energy transfer effect, and is the mainstream of the future development of the battery equalization technology.
At present, the domestic battery equalization management technology is still in a lagging state, the existing equalization technology has various defects, and the equalization method which is relatively simple in circuit and good in equalization effect is designed to greatly promote the development of BMS and the industrialization of power batteries.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to solve prior art and have that the structure is complicated, the energy consumption is big, control logic is complicated, balanced inefficiency scheduling problem, provide a simple structure, the energy consumption is low, balanced effectual power battery group initiative equalizing control system to solve the arbitrary free overcharge and the overdischarge problem of group battery in the use, prolong the life of whole group battery.
In order to solve the technical problem, the utility model provides a power battery organizes initiative equalizing control system, include: the device comprises a power battery pack, an information acquisition module, a main control module, a DC/DC module, an overcurrent protection module, a balance control module and a balance circuit module;
the power battery pack is formed by connecting n batteries in series;
one end of the information acquisition module is connected with each single battery in the power battery pack, and the other end of the information acquisition module is connected with the main control module, so that the acquisition of voltage analog values of the single batteries is mainly completed, and then the digital values are obtained through the conversion of an AD converter;
the processor of the main control module adopts a DSP arithmetic unit, and a battery pack formed by connecting n batteries in series can acquire n paths of AD values and output 2(n +1) paths of PWM control signals, and mainly completes the work of AD conversion, SOC estimation, external communication, PWM control signal output and the like of voltage signals of the single batteries;
the high-voltage input end of the DC/DC module is connected with the positive electrode and the negative electrode of the power battery pack, and the low-voltage output end of the DC/DC module is connected with a low-voltage electrical system of the vehicle to supply power for the DSP, the detection chip and the like;
the overcurrent protection module consists of a sampling part and a control part, the sampling resistor collects balanced current, and the balanced loop is disconnected when the current exceeds a set limit value;
the input end of the balance control module is connected with the main control module, and the drive end of the balance control module is connected with the power battery pack through the balance circuit module;
the equalizing circuit module comprises a switch network formed by connecting a plurality of groups of analog electronic switches and rectifier diodes in series, 2(n +1) MOS (metal oxide semiconductor) switch tubes and 2(n +1) rectifier diodes are needed for a battery pack formed by connecting n batteries in series, the switch tubes are connected to each node of the battery pack in series through the rectifier diodes, and the equalizing circuit module further comprises an energy storage inductor L1 and an overcurrent sampling resistor R1.
Further, in order to enable the power battery pack to store higher energy and have longer service life, the power battery pack is a lithium ion battery pack.
The utility model has the advantages that:
the utility model discloses a power battery group initiative equalizing control system be energy non-dissipation type to the inductance is energy storage component, by MOS switch tube decision energy transfer direction, can realize the transmission of energy between two arbitrary section batteries in the group battery, avoids the energy loss that unnecessary charge-discharge caused, can reach the purpose quick, high-efficient balanced power battery group.
Drawings
The invention will be further described with reference to the accompanying drawings:
fig. 1 is a schematic structural diagram of an active equalization control system of a power battery pack of the present invention;
fig. 2 is a schematic structural diagram of an equalizing circuit module according to an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings by way of examples.
As shown in fig. 1, the present embodiment discloses an active equalization control system for a power battery pack, including: the power battery pack 10, the information acquisition module 20, the main control module 30, the DC/DC module 40, the overcurrent protection module 50, the balance control module 60 and the balance circuit module 70;
the power battery pack 10 is formed by connecting n batteries in series;
one end of the information acquisition module 20 is connected with each single battery in the power battery pack 10, and the other end is connected with the main control module 30, so that the acquisition of the voltage analog value of each single battery is mainly completed, and then the digital value is obtained through the conversion of an AD converter;
a processor of the main control module 30 selects a DSP arithmetic unit, and a battery pack formed by connecting n batteries in series can acquire n paths of AD values and output 2(n +1) paths of PWM control signals, and mainly completes the work of AD conversion, SOC estimation, external communication, PWM control signal output and the like of voltage signals of single batteries;
the high-voltage input end of the DC/DC module 40 is connected with the positive and negative electrodes of the power battery pack 10, and the low-voltage output end is connected with a low-voltage electrical system of the vehicle to supply power for a DSP (digital signal processor), a detection chip and the like;
the overcurrent protection module 50 consists of a sampling part and a control part, a sampling resistor collects balanced current, and the balanced loop is disconnected when the current exceeds a set limit value;
the input end of the balance control module 60 is connected with the main control module 30, and the driving end is connected with the power battery pack 10 through the balance circuit module 70;
the equalizing circuit module 70 includes a switch network formed by connecting a plurality of groups of analog electronic switches and rectifier diodes in series, 2(n +1) MOS switch tubes and 2(n +1) rectifier diodes are required for a battery pack formed by connecting n batteries in series, the switch tubes are connected to each node of the series battery pack 10 through the rectifier diodes, and the equalizing circuit module further includes an energy storage inductor L1 and an overcurrent sampling resistor R1.
Further, in order to enable the power battery pack to store higher energy and have longer service life, the power battery pack is a lithium ion battery pack.
In the present embodiment, as shown in fig. 2, a power battery pack having 4 batteries connected in series is taken as an example, and the structure of the equalizing circuit module 70 is described as follows:
the battery pack comprises 4 batteries connected in series, wherein the 4 batteries are respectively B1, B2, B3 and B4, a capacitor C1 … C4 is connected with each single battery in parallel, M11, M12, … M51 and M52 are 5 pairs of MOS (metal oxide semiconductor) switching tubes, D11, D12, … D51 and D52 are 5 pairs of rectifying diodes, the MOS switching tubes and the rectifying diodes are connected in series and then are connected to positive and negative nodes of the batteries in pairs respectively, L1 is an energy storage inductor, and R1 is a balanced overcurrent sampling resistor.
With reference to fig. 2, it is right to explain the principle of the equalizing operation performed by the equalizing circuit module of the present invention as follows:
when the main control module 30 detects that the energy of the battery B1 is higher than the energy of the battery B3, a control signal is output to the equalization control module 60, the equalization control module 60 outputs a corresponding PWM modulation signal to control the simultaneous opening of the positive node MOS switch M11 and the negative node MOS switch M22 of the battery B1, the battery B1 releases energy, the energy is stored in the inductor L1, after a set time, the positive node MOS switch M11 and the negative node MOS switch M22 of the battery B1 are closed, the positive node MOS switch M32 and the negative node MOS switch M41 of the battery B3 are opened simultaneously, and the energy in the inductor is transferred to the battery B3, so that the energy is transferred from the battery B1 to the battery B3. During the equalization process, the overcurrent protection module 50 detects the equalization current, when the equalization current exceeds a preset value, a signal is fed back to the main control module 30, and the equalization control module 60 adjusts the frequency and duty ratio of the output PWM control signal, so as to ensure the safety of the equalization process until the equalization is finished.
In the process, the battery B1 and the battery B3 can be single batteries or multiple batteries connected in series, the on-off of different MOS switching tubes is controlled, and energy transfer can be realized between any single battery and the single battery, between the single battery and multiple batteries connected in series, between the multiple batteries connected in series and multiple batteries connected in series in the battery pack.
Claims (3)
1. An active equalization control system for a power battery pack, comprising: the device comprises a power battery pack, an information acquisition module, a main control module, a DC/DC module, an overcurrent protection module, a balance control module and a balance circuit module;
the power battery pack is formed by connecting n batteries in series;
one end of the information acquisition module is connected with each single battery in the power battery pack, and the other end of the information acquisition module is connected with the main control module, so that the acquisition of voltage analog values of the single batteries is mainly completed, and then the digital values are obtained through the conversion of an AD converter;
the processor of the main control module adopts a DSP arithmetic unit, and a battery pack formed by connecting n batteries in series can acquire n paths of AD values and output 2(n +1) paths of PWM control signals, and mainly completes the work of AD conversion, SOC estimation, external communication, PWM control signal output and the like of voltage signals of the single batteries;
the high-voltage input end of the DC/DC module is connected with the positive electrode and the negative electrode of the power battery pack, and the low-voltage output end of the DC/DC module is connected with a low-voltage electrical system of the vehicle to supply power for the DSP, the detection chip and the like;
the overcurrent protection module consists of a sampling part and a control part, the sampling resistor collects balanced current, and the balanced loop is disconnected when the current exceeds a set limit value;
the input end of the balance control module is connected with the main control module, and the drive end of the balance control module is connected with the power battery pack through the balance circuit module;
the equalizing circuit module comprises a switch network formed by connecting a plurality of groups of analog electronic switches and rectifier diodes in series, 2(n +1) MOS (metal oxide semiconductor) switch tubes and 2(n +1) rectifier diodes are needed for a battery pack formed by connecting n batteries in series, the switch tubes are connected to each node of the battery pack in series through the rectifier diodes, and the equalizing circuit module further comprises an energy storage inductor L1 and an overcurrent sampling resistor R1.
2. The power battery pack active equalization control system of claim 1, wherein the power battery pack is a lithium ion battery pack.
3. The active equalization control system of power battery pack according to claim 1, wherein an inductor is used as an energy storage element, and an MOS switching tube determines the energy transfer direction, so that the energy transfer between any two batteries in the battery pack can be realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020551424.8U CN212148520U (en) | 2020-04-07 | 2020-04-07 | Active equalization control system of power battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020551424.8U CN212148520U (en) | 2020-04-07 | 2020-04-07 | Active equalization control system of power battery pack |
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| Publication Number | Publication Date |
|---|---|
| CN212148520U true CN212148520U (en) | 2020-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020551424.8U Expired - Fee Related CN212148520U (en) | 2020-04-07 | 2020-04-07 | Active equalization control system of power battery pack |
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| CN (1) | CN212148520U (en) |
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2020
- 2020-04-07 CN CN202020551424.8U patent/CN212148520U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee |
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